[all-commits] [llvm/llvm-project] b350bc: [libc++] Verify forward_list self-merging is a no-...

[Peng Liu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b350bc2c0b88488f6c4eb84aadd4e74c67ca9b06
      https://github.com/llvm/llvm-project/commit/b350bc2c0b88488f6c4eb84aadd4e74c67ca9b06
  Author: Peng Liu <winner245 at hotmail.com>
  Date:   2025-03-19 (Wed, 19 Mar 2025)

  Changed paths:
    M libcxx/docs/Status/Cxx23Issues.csv
    M libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue.pass.cpp
    M libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_lvalue_pred.pass.cpp
    M libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue.pass.cpp
    M libcxx/test/std/containers/sequences/forwardlist/forwardlist.ops/merge_rvalue_pred.pass.cpp

  Log Message:
  -----------
  [libc++] Verify forward_list self-merging is a no-op (#129985)

https://wg21.link/LWG3088 requires that `forward_list::merge()` is a no-op when passed
`*this`, which aligns with the behavior of `list::merge`. Although libc++'s implementation
of `forward_list::merge()` already meets this requirement, there were no tests to verify
this behavior. This patch adds the necessary tests to ensure that self-merging remains a
no-op and prevents any future regressions on this.

Closes #104942.



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